Draft-regulating apparatus for furnaces.



No. 739,321. PATENTED SEPT. 22', 1903. A KLEIN. BIC-AFT RHQEELATIRG APPARATUS FOR FURNACES.

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M No. 739,321.

v A. KLEI DRAFT REGULATING APPARATUS FOR FURNACES. APPLICATION FILED JUNBL27, 1901.

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a ma w 7 M a flfl way 0 No. 739,321. PATENTED SEPT. 22, 1903;

' A. KLEIN.

DRAFT RBGULATING APPARATUS FOR FURNACES.

APPLICATION PILED UNE 27. 1901. -Y

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; UNITED ST TES Iatented September 22, 1903 PATENT ()FFICE.

ADOLF KLEIN, or VIEN A, AUSTRIA-HUNGARY, ASSIGNOR TO socinrn DES INVENTIONS JAN 'SZVOZEPANIK a cm, or VIENNA, AUSTRIA-HUNGARY,

A FIRM.

DRAFT-REGULATING APPARA U FOR FURNACES.

SPECIFICATION forming part of Letters Patent No."739,321, dated September 22, 1903.

Application filed June 27, 1901. Serial No. 66.2 72. (Il'omodeh) I ers skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters and figures of reference marked thereon,

| 3 which form a part of this specification.

A characteristic feature of' myinvention' lies in the provision of means whereby a draftdamper is maintained in anormal or adjusted position relatively to the draft -flue so long as the furnace door is closed, whereby said damper is maintained in that position when the furnace-door is opened to prevent strong drafts of air across the incandescent fuel, which would deaden it, whereby the damper is caused to move rapidly to a maximuinopen position when the furnace-door is again closed and to slowly move back to its normal or adjusted position, and whereby thedamper is caused to rapidly move to its normal position should the furnace-door be opened when said damper is not in said normal position.

A further characteristic feature of my invention resides in the provision of aresistance antagonizing the aforesaid movements of the 3 5 damper to cause the same to move slowly from and back to its normal position.

A further characteristic feature of my invention resides in the provision of means for automatically reducing the resistance antago- 0 n'izing the movement of the damper to its normal position when the furnace-door is opened, so as to cause said damper to rapidly move to its said normal position should said damper not bei'n that position when the furnace-door is opened but that my invention may be fully understood I will describe the same in detail,

reference being had to the accompanying drawings, 1n which- Figure 1 is an elevation, partly in section,

bodying my invention applied to a steamb'oiler, the casing for the valve controlled by the opening and closing of the furnace-door and the pipes 9, 13, and 14, connecting said casing with the appliances which control the movements of the damper, being omitted. Fig. 1 is a sectional elevation, drawn to an en larged scale, of the draft-regulator shown in 7 Fig. 1, the piston-rod and furnace-doorbeing partly broken away. Figs. 2 and 3 are sectional detail views illustrating the main or distributing valve in its position when the furnace-dooris open and closed, respectively. Fig. 4 is an enlarged vertical sectional view of the non-return valve of the cataract and the appliances for unseating said valve. Fig. 5

is a detail View of the devices for adjusting the travel of the damper to'more or less close the draft-flue. Figs. 6 and"? are enlarged fragmentary sectional detail views of the Valve mechanism whichcontrols the supply of steam to and its exhaust from the poWercylinder, Fig. 6 showing the parts in theirrelative position when the power-piston is atthe limit of its outstroke, as shown in Fig. 1, and 7 Fig; 7 showing said parts in their relative positionsflwh'en said piston is at the limit of its instroke, and Fig. 8 is asectional View illustrating a simplified construction of the valve mechanism shown in Figs. 6 and 7.

In Fig. 1 I have shown, as an example, my automatic draft regulator as arranged in front of astea'm-boiler B of the Lancashire type, 11 indicating the furnace or fuel door, F the draft-flue, and 6 its damper, connected by any suitable flexible connectiomasachain, cable, or rope, and hereinafter'referred to as 5 a cable 46, runningover guide-pulleys46 to a drum 48, Figs- 1 and 5, mounted to revolve in bearings in the branches of a forked 9o terminal of the'piston rod 3. To one of the journals of drum 48 or to said drum, as shown in said Figs. 1 and 5, is secured a ratchetwheel 49, engaged by a laterally projecting tooth on a pawl 50, pivoted to the aforesaid forked terminal of the piston-rod 3,.and the arm 52 of said forked terminal is longerthan its other arm and is bent at right angles across illustrating an automatic draft-regulator em- 0 the path of the cable 46 and performs the function of an indicator"elementnamely, a pointer-in conjunction with a complementary indicator element 51, secured to said cable, one end of whichv is secured to the drum 48, and the latter can be rotated by means of a crank 47 for the purpose of winding thereon more or less of the cable 46, and thereby determining the extent to which the damper is to move into the draftflue F, and consequentl y the maximum cut-oit,the pawl 50 pre-- venting the unwinding of the cable under the weight of the damper. I am thus enabled to regulate the draft as circumstances may require and at the same time to observe the movements of the damper and see whether the latter works properly. The furnace-door 11 has an arm 11, Figs. 1", 2, and 3, that projects into a longitudinal slot 10 in a radial arm 10 on or secured to a four-way main or distributing cock or valve 10, the casing of which has four ports, to which are respec- Iively secured the pipes 9, 12, 13, and 14, the arrangement being such that when the furnace-door is closed the pipes 9 and 12 and the pipes 13 and 14, respectively, will be placed in communication, (see Fig. 3,) while when said furnace-door is opened the pipes 12 and 14 and the pipes 9 and 13, respectively, will be placed in communication, as shown in Fig. 2, for purposes hereinafter explained, the

pipe 12 being in communication with the steam space or collector of the boiler. The piston-rod 3, above referred to, carries two pistons 2 and 4, the former working in a cylinder practically open at its lower end, while piston 4 works in the cylinder 5 of a cataract, whereby the damper (3 during normal operation is caused to move at a comparatively low rate of speed to and from its normal or adjusted position. The cataract comprises a horizontal tubular member 5 of comparatively small cross-sectional area and a vertical tubuar member or cylinder 5 of relatively largel cross-sectional area, both members arranged in T form and in communication with each other. Said cataract comprises, furthermore, a reservoir 35, closed fluid tight and encompassing the vertical member or cylinder 5 and in communication therewith through a comparatively small port 34, near the foot of the cylinder. To one end of the horizontal member 5 of the cataract is connected a circulating-pipe 36, said pipe extending into reservoir 35, near to its bottom, and at the junction of this pipe 30 with said member 5, is located a regulating valve of any wellknown or preferred type for regulating the .flowof fluid to and from said pipe and member 5. To the last-named member 5 of the cataract is connected a second pipe 37, extending also near to the bottom of reservoir 35, and inthe branch leading from said member to said pipe 37 is seated a check-valve 16, having an angular arm 39, projecting verti cally therefrom, the upper horizontal member of which arm is slotted for the reception of the headed end of the stem 39 of a pistonvalve 42, said stem also carrying a piston 38, working in a suitable cylinder 15. The piston 38 is under the influence of a spring 41, acting on its upper face and holding it normally at the limit of its instroke on an annular shoulder in the cylinder which is connected below the piston with the pipe 14, leading from the casing of the main or distributing valve 10, hereinbefore referred to. The piston-valve 42 controls the communication between the piston-cylinder 15 and an exhaust-chamber 43 below said cylinder, to which chamber is connected an exhaust-pipe 45, the communication between the chamber and pipe being effected through a peripheral circular port or passage 44, formed near the inner or lower end of valve 42.

The described construction is clearly shown in Fig. 4 and the arrangement is such that when the piston 38 is in its normal position the gravityvalve 16 will have su fficient play to move off its seat under pressure of the fluid rising in pipe 37, but preventing or checking the flow of fluid back to the reservoir 35 through said pipe.

As is well known, loss of liquid in cataracts as heretofore constructed had to be compensated or made up at once if violent shocks were to be avoided in a cylinder completely filled with liquid during the movement of the damper to its normal position. This disadvantage is obviated in the described construction of cataract, because the instroke oi the piston 4 is made at such a slow rate of speed that the cylinder above the piston will at all times be filled with liquid forced thereinto during the instroke. Furthermore, the reservoir 35 need not contain a larger quantity of liquid than is necessary to properly cover or lute the lower open ends of the pipes 36 and 37. Inview of this and by using a fluidtight reservoir I am enabled to use water in-. stead of oil or glycerin, as is necessary in cataracts of usual construction. This use of water has the further advantage in that its resistance is invariable, which is not the case with oil or glycerin, the resistance of which varies with the degree of their viscosity under temperature variations.

It will readily be seen that when steam is admitted to the pistolrcylinder 15 through pipe 14 the piston 38, and with it the pistonvalve 42, will make its outstroke idly for a certain distance, and will then not only unseat valve 16, but bring the reduced portion 44 of the piston into register with exhaustpipe 45, thus establishing communication between said pipe and chamber 43 to allow water of condensation collecting in said chamber to drain therefrom. By these means I am enabled to keep the piston-cylinder 15 and the steanrsupply pipe 14 free from water of condensation, and inasmuch as steam is admitted to cylinder 15 whenever the furnace-door 1]. is opened, as hereinafter more particularly described, vno great amount of water of condensation can collect inthe piston-cylinder 15.,

Referring now particularlyto Figs. 1, 6, and 7, at its upper end the power-cylinder 1 is connected through a pipe 7 ,to an upper chamber 8, formed in a valve-casing 8,.hav-,

ing at its lower end a second chamber 8" and below chamber 8 a steam-chamber 81 in communication with said chamber 8 through a valve-port 25, having a seat for a cutoff valve 22, said steam-chamber 81 being in communi-' cation with chamber 8 at the lower. end of V the valve-casing through an axial cylindrical pipe 27.

passage 29. In the valve-casing'S are,furthermore, formed two passages, one, 26, placing.

steamchamber 81 in communication with the lower end of the axial passage 29 and cham ber 8" anda passage 28 placing the upper 17' and a recess or socket in its upper face,

1 about to reach the limit of its instroke.

in which is seated a coiled spring 23, acting on the aforesaid. valve 22 to hold it to its seat and close port 25, the valve 22 being loosely mounted on the rod 18 of piston-valve 17,

which rod carries'an abutment 24, adaptedon its instroke to impinge on valve 22 and unseat the same against thestress of its spring 23. In the lower head of the valve-casing is formed a drain-passage 30,leadin g from chamber S", the inlet of which is normally closed bya spring-seated valve 32, pivoted in said chamber and provided with an arm 31 ,extending into the aforementioned axial passage 29 of the valve-casing, said arm being acted on by the piston-valve .17 on its down or in stroke to unseat valve 32, Fig. 6. The object of this arrangement is to exhaust water of condensation from steam-chamber 8" and the steamsupply pipe, which is connected to steam- -chamber 81 of valve-casing 8 and the main or controlling valve 10, hereinbefore referred to,

whenever the piston-valve 17 reaches or is The piston-rod 18 projects through a stuffing-box out of the upper end ofvalve-casing 8 and is pivoted to the shorter arm of a lever 19, fulcrumed to a standard on'the valve-casing,

:1 said lever under the stress of a spring 21 acting to draw said shorter arm downwardly,- and consequently raise the longer arm, which terminates in a fork 19, Figs. l and 6, embracing-the power-piston rod 3, which at a suitable point carries an abutment in the form'of a collar 20,which on the instroke of the power-piston 2 impinges upon said fork 'andtilts lever 19 against the stress of the spring21, the valve-rod 18 making its outstroke." During a portion of this stroke the valve 22 will be acted on by. its spring- 23 to .hold it in contact, with -the. abutment .24 .on valve-rod 18, which abutment moves out of contactiwith said valve before-the power piston has completed its instroke, the valve cutting off the steam from pipe 9 to valvecasing chamber 8, and when said power-piston 2 is about to complete its said instroke the piston-valve 17 -will be in the position shown in Fig. 7 and bearing on valve22. -In this position of valve 17 its reduced portion will be in register with exhaust-pipe 27 to exhaust the steam from chamber 8 and cylinder 1, allowing the power-piston 2 to make its outstroke under the weight of the damper. At the same time the lower end of the pistonvalve 17 uncovers the outlet-passage 26, ad'- mitting live steam to axial passage 29 below said piston-valve and. to chamber 8, whereby valve 22 is firmly held to its seat and the piston-valve in its described position, and as valve 17 movesout of contact with arm 31 of drain-valve 32 the latter, under the action of its spring, will close the drain 30. a In Fig. 8 I have shown a preferred form of auxiliary-valve mechanism very much simpler than that shown in Figs. 6 and 7. The valve-casing 8 is cylindrical and enlarged at its lower end for the collection of water of being connected at suitable points intermedi-' ate of the pistons to the steam-supply pipe 9 and to the power-cylinder 1 through pipe 7.

: In the position of the piston-valve shown in Fig. 8 steam is admitted to power-cylinder 1, its piston 2 making its instroke, the lower piston-valve 17 acting on the valve-arm 31 to hold the drain-valve 32 off its seat and also cutting off the communication'between the chamber 0 and pipe 9 through passage 26. When the abutment 20 on power-piston rod outstroke, and when power-piston 2 is about to reach or hasreached the limit of its .in-

stroke the valves will be at the limit of their outstroke, valve 17 uncovering the outlet of passage 26 and covering the outlet of pipe 9,

thus cutting off steam from power-cylinder and admitting steam to the under face of piston-valve 17 7 At the same time pistonvalve 17 will uncover exhaust-passage 27,

thereby-exhausting the steam from'powercylinder-1, the piston of which then makes its outstroke under the weight of th'edamper,

while the valves will be held in their de'- I scribed positions by the steam-pressure on the under face of valve 17" until the furnace door is opened and again closed. The'operation of the appliances described" is as follows: The damper 6 havingbeen ad justed to a normalposition in the flue con trolled thereby by means of the appliances;

described inreference to Figs. 1; and '5,-tl1e," fire is started and the damper held'fully open through the medium'of the cable 46,-and when properly started the damperisreleased .the spring 21 on valve-lever 19.

and the furnace-door closed, the valves 17 (shown in Figs. 1 and 6) under the action of When the pressure of the steam generated is suificient to operate the draft-regulating appliances, a valve (not shown) in the steam-main 12 is opened. As hereinabove stated, the normal position of the controlling-valve--namely, its position when the furnace door is closedi's that shown in Fig. 3, from which position it is moved to that shown in Fig. 2, when the .furnace-door is opened, while the normal position of the valves 17 and 24 is that shown in Fig. 7, or, in other words, the normal positions of the damper and the aforesaid valves are determined by the limit of the outstroke of the power-piston 2 and valve-rod 18, as will hereinafter appear. Hence, when the valve in the steam-main is opened and remains open after the pressure of the steam generated in the boiler is suflicient to operate the damper-actuating appliances, steam will flow from pipe 12 to pipe 9 through the passage in the distributing-valve 10,which places these pipes in communication with each .other, and from pipe 9 the steam will flow through valve-port- 25, valve-casing chamber 8, and pipe 7 to upper end of power-cylinder 1, causing its piston 2 to make its instroke. As soon as abutment 20 contacts with the longer arm of valve-lever 19 said lever will be gradually rotated on its pivot against the stress of its spring 21, causing the valves 17 and 24 to make their outstroke, the completion of which takes place when the powerpiston is about to reach or has reached the limit of its instroke, the position of the valves 17 and 22 being that shown in Fig. 7, the supply of steam to the power-cylinder being cut off and said cylinder placed in communication with the exhaust-pipe 27,

throu h )lJG 7 easin -chamber 8 )assa e D b 7 b 28, and reduced portion 17 of piston-valve .17, which latter valve has also moved out of contact with the arm on the drain-valve 32, which has closed the drainage-port, while said piston-valve has also uncovered the passage 26in communication with the receivingchamber 81 in the valvecasing, and consequently with pipe 9, thus admitting steam to the under side of pistonvalve 17 to hold it and valve 24 in their said position shown in Fig. 7. As soon as the power-piston 2 is relieved from pressure said piston makes its outstroke under the weight of the damper until the piston has reached the limit of its said outstroke, when the damper 6 will also have reached its normalposition in the flue,the various elements remaining in the described positions solong as the furnace-door is closed. Owing to the resistance of the liquid in the cataract to the movements of the piston 4:, it will readily be seen that the instroke, as well as the outstroke, of piston 2 is effected very slowly, so that the damper 6 will move to its normal position at a correspondingly slow rate of speed. The object of this is to pro vide greater draft for a certain period of time after stoking, and as the instroke of the power-piston is also antagonized by the liquid in the cataract neither stroke can take place steam-main 12, steam from pipe 9 and from the lower part of valve-casing S will be exhausted, valve 17 will be relieved from pres sure, and spring 21, acting on valve-lever 19, will move the valves 17 and 22 into their positions shown in Fig. 6. At the same time live steam is supplied to valve-casing 15 and the check-valve 16 is unseated. These operations have no influence on the power-piston, hence do not influence the damper, which remains in its normal position until the furnace door is closed, whereby the controllingvalve 10 will be moved back to its normal position, Fig. 3, and steam admitted to powercylinder to first move the damper to its full flue-opening position, the valves 1.7 and being moved back to their normal positions, (shown in Fig. 7,) after which said power-piston and damper move back to their normal positions, as above set forth. Should the furnace-door be opened while the power-piston 2 is making its outstroke, the check-valve 16 will be unseated, as above described, thus opening an additional outflow-channel for the cataract liquid above the piston 1 and one of greater area, thereby reducing the resistance on piston 42 to such an extent as to enable the power-piston under the weight of the damper to make its outstroke very rapidly, the damper 6 moving rapidly to its normal position, as will be readily understood and for the purposes hereinbefore described.

From the above description the operation of the valves shown in Fig. 8 will be fully understood.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

1. The combination with the fuel-door of a furnace, its damper, a power-cylinder, its piston connected to said damper and a resistance antagonizing the movements of said piston; of means controlled by the movements of the fuel-door, operating to admit motive fluid to the powercylinder to drive its piston in one direction, then to cut off and exhaust motive fluid from said cylinder to allow the piston to make its return stroke under the weight of the damper when the fuel-door is closed and. to reduce the resistance to the return stroke of the piston when the fuel-door is opened during said return stroke, for the purpose set forth.

. 2. The combination with the fuel-door of a furnace, its damper, a power-cylinder, its piston connected to saidv damper, a resistance antagonizing the movements of the piston in either direction and means for regulating said resistance; of means controlled by the movements of the fuel-door, operating to admit motive fluid to the power-cylinder to drive its piston in one direction, then to cut .off and exhaust motive fluid from said cylinder to allow the piston to make its return stroke under the weight of the damper when the fuel-door is closed and to reduce theresistance to the return stroke of the piston when the fuel-door is opened during said return stroke, for the purpose set forth.

3. The combination with the fuel-door of a furnace, its damper, apower-cylinder, its piston connected to said damper, a cataract comprising a cylinder, a piston connected to the power-piston, means placing opposite ends of said cataract-cylinder in communication, an

ends in communication, anda valve in said auxiliary passage, closing said auxiliary passage; of means controlled by the movements of the fuel-door, operating to admit motive fluid to the power-cylinder to drive its piston in one direction, then to cut off and exhaust motive fluid from said cylinder to allow the piston to make its return stroke under the weight of the damper when the fuel-door is closed, and to open the valve in the aforesaid auxiliary. passage of the cataract, when the 'fueldoor is opened, for the purpose set forth.

. 4:. The combination with thefuel-door of a furnace, its damper, a power-cylinder, its piston connected to said damper, a cataract comprising a cylinder, a piston connected to the power-piston, means placing opposite ends of said cataract-cylinder in communication, an auxiliary passage also placing said opposite ends in communication, and a gravity-valve in said auxiliary passage, closing said auxiliary passage; of means controlled by the I movements of the fuel-door, operating to admit motive fluid to-the power-cylinderlto drive its piston in one direction, then to cut j off and exhaust motive fluid from said cylin- ,der to allow the piston to make its return stroke under the weight of the damper when the fuel-door is closed, and to unseat the ,valve in the aforesaid auxiliary passage of d prising a cylinder, a piston connected to the power-piston, means placing opposite ends of said cylinder in communication, an auxiliary 6 5 passage, also placing said ends in communication, and a valve in said passage arranged to move off its seat under the pressure of ascending liquid and to move to its seat under the pressure of descending liquid; of means controlled by the movements of the fuel-door,

operating to admit motive fluid to the power- 6. The combination with the fuel-door of a furnace, its damper, a power-cylinder, its piston connected to said damper, a cataract,comprising a cylinder, a piston connected to the power-piston, means placing opposite ends of said cataract-cylinder in communication, an auxiliary passage also placing said opposite ends in communication, a check-valve closing said passage, a piston-cylinder, a piston and its rod connected to said valve; of means controlled by the movements of the fuel-door, operating to admit motive fluid to the powercylinder to drive its piston in one direction, then to cut off and exhaust motive fluid from said power-cylinder and from the check-valve piston-cylindenwhen the fuel door is closed,"

and to admit motive fluid to the last-mentioned cylinder to causeits piston to unseat the aforesaid check-valve when'the fuel-door is opened, for the purpose set forth.

7'. The combination with the power-piston,-

a damper connected thereto, a cataract com prising a receiver, a cylinder therein, a piston working in said cylinder and connected to the power-piston, said cataract-cylinder open at its upper end and having a port at its lower end, a passage across the upper end of said cylinder, return-pipes extending'from opposite ends of said passage near to the bottom of the receiver, a gravity check-valve in one of said pipes, a cylinder,its piston and piston-rod connected to said valve to allow it to move off its seat independently of the piston under the pressure of ascending liquid;

of means, controlled by the movements of the fuel-door of a furnace,-operating to admit: motive fluid tothe power-cylinder to drive its piston in one direction, then to cut off and exhaust motive fluid from said powercylinder to allow its piston to make its return stroke under the weight of the damper, and to-exhaust motive fluid from the check-valve piston-cylinder when the fuel-door is closed, and to. admit motive fluid to said check-valve cylinder to cause its piston to unseat the checkvalve when the fuel-door is opened,for the purposes set forth.

8. The combination with the power-piston, a damper connected thereto, a cataract comprising a receiver, a cylinder therein, a piston working in said cylinder and connected to the power-piston, said cataract-cylinder open at its upper end and having a port at its lower "end, a passage across the upper end of said cylinder, return-pipes extending from oppo site ends of said passage near to the bottom of the receiver, a regulating-valve in one of said pipes, a gravity check-valve in the other pipe, a cylinder, its piston and piston-rod connected to said valve to allow it to move off its seat independently of the piston under the pressure of ascending liquid; of means, controlled by the movements of the fuel-door of a furnace, operating to admit motive fluid to the power-cylinder to drive its piston in one direction, then to cut off and exhaust motive fluid from said power-cylinder to allow its piston to make its return stroke under the weight of the damper, and to exhaust motive fluid from the check-valve piston-cylinder when the fuel-door is closed, and to admit motive fluid to said cheek-valve cylinder to cause its piston to unseat the check -valve when the fuel-door is opened, for the purposes set forth.

9. The combination with the fuel-doorof a furnace, the damper, a power-cylinder, its piston and piston-rod connected to said damper, a valve-oasing having admission, delivery and exhaust ports, a valve-chamber, and a passage leading from said admission-port to the inner end of said chamber, a pipe conneoting the delivery-port of the casing with the outer end of the power-cylinder, avalve in said chamber controlling said ports and passage, means automatically unseating the valve to admit motive fluid to the power-cylinder and close the exhaust-port and the illner end of said passage, and means operated by the piston-rod on the instroke of the piston to seat the valve and open the exhaust and inner end of the aforesaid passage; of a pipe connecting the admission-port of the valvecasing to a source of supply of motive fluid, and a distributing-valve in said pipe operated by the movements of the fuel-door and operating to exhaust motive fluid from the pipe when the fuel-door is opened and to admit motive fluid to said pipe when again closed, for the purpose set forth. i

10. The combination with the fuel-door of a furnace, the damper, a power-cylinder, its piston and pistonrod connected to said damper, a valve-casing having admission, delivcry and exhaust ports, a valve-chamber, a passage leading from the inner end of said chamber to the admission-port, a drainageport in the lower head, and a pivotally-arranged spring-seated valve closing said port, said valve having an arm projecting into the lower end of the valve-chamber, a pipe connecting the delivery-port with the outer end of the power-cylinder, a controlling-valve organized to control the admission and exhaust of motive fluid to and from the power-cylim der also controlling the outlet of the aforesaid passage and the drain-valve, means for automatically unseating the valve and thereby establishing communication between the admission and delivery ports, closing the exhaustport and the outlet of the aforesaid passage, and at the same time unseating the drain-valve, and means operated bythe piston-rod 011 the instroke of the power-piston to seat the valve and thereby out off the deliveryp0rt from the admission-port, and simultaneously therewith open the exhaust port and the outlet of the aforesaid passage and close the drain-valve; of apipe connecting the admission-port to a source of supply of motive fluid, a distributing-valve in said pipe operated by the movements of the fueldoor and operating to admit motive fluid to the aforesaid pipe when the fuel-door is opened,

and to cut off and exhaust motive fluid from the pipe when again closed, for the purpose set forth.

11. The combination with the fuel-door, the power-cylinder, its piston and rod to which the damper is connected, said rod carrying an abutment, a "alve-casing having admission, delivery and exhaust ports, said delivery-port connected to the outer end of the power-cylinder, apipe connecting the admission-port to a source of supply of motive fluid, a drainport in the lower head of the casing, aspringseated, pivotally-mounted valve for said port provided with an arm, and a passage in the valve-casing leading from its inner end to the admissionport of a twin piston-valve, its

rod, a lever pivoted intermediate its ends to said rod, one end of said lever projecting into the path of the abutment on the power-piston rod, a spring acting on the other end of the lever to cause the valve to make its instroke, thereby placing the admission and delivery ports into communication, cutting off the exhaust-port and inner end of aforesaid passage and unseating the drain-valve, and a distributing-valve in the aforesaid supplypipe operated by the movements of the fueldoor to admit motive fluid to the pipe when the fuel-door is closed and to cut olf and exhaust motive fluid from said pipe when said door is opened, for the purpose set forth.

12. The combination with the damper of a furnace, at power-cylinder and piston, the piston-rod bifurcated at its outer end, one of the arms of the fork longer than the other and provided with a horizontal index-finger, a revoluble drum mounted in the fork, and a locking device to lock said drum against 1'0- tation; of a cable having one end secured to the drum and the other to the damper, said cable carrying a complementary indicating device proximate to the aforesaid index-finger, for the purpose set forth.

13. The combination with the power-cylinder, its piston and piston-rod and means for reciprocating said piston; of a cataract comprising a fluid-tight receiver 35, a cylinder 5 having a small port 34 at its inner end and a tubular outer cross-head, return-pipes at each end of said cross-head and extending near to the bottom of the receiver, and a piston working in said cylinder and carried by the powerpiston rod; of a regulating-valve in one of said return pipes, a gravity check-valve 16 in the other return-pipe, an auxiliary pistonthereby cause the piston-valve 42 to uncover the drain-port of the collector and then to exhaust the motive fluid; for the purpose set forth. 1 p

In testimony that I claim the foregoing as cylinder, a collector for water of condensation in communication with said cylinder, said collector provided with a drain-port, a piston 38 working in said cylinder, a spring acting on the outer face of the piston, the piston-rod 39 loosely connected to aprojection on the valve 16, a piston-valve 42 on said rod ence of two subscribing witnesses.

controlling the communication between the l ADOLF' KLEIN.

cylinder and collector, and means for period- Witnesses: ically admitting motive fluid to the inner face JOsEF RljBASOH, of piston 38 to unseat the check-valve and l O. B. HURST.

my invention I have signed my name in pres 

